Dinwiddie County climate

Dinwiddie County Frost Dates and Growing Season

NOAA 1991-2020 normals for Stony Creek 2 N, 23.2 km from Dinwiddie County, elevation 105 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Stony Creek 2 N. A median date has an even chance of a later freeze in spring, or an earlier one in fall.

The last spring freeze typically comes around April 9 and the first fall freeze around October 29, a growing season of about 203 days.

Median at 36°F
last April 22, first October 20
Median at 32°F
last April 9, first October 29
Median at 28°F
last March 29, first November 8

Last freeze in spring

The chance of a later freeze than the date shown. At 10 percent, one spring in ten still freezes after the date; planting after the 10 percent date for 32°F is the cautious choice.

Threshold10%20%30%40%50%60%70%80%90%
36°FMay 10May 4Apr 30Apr 26Apr 22Apr 19Apr 16Apr 14Apr 9
32°FApr 26Apr 19Apr 15Apr 12Apr 9Apr 6Apr 3Mar 31Mar 26
28°FApr 11Apr 6Apr 3Mar 31Mar 29Mar 26Mar 21Mar 18Mar 12
24°FMar 31Mar 26Mar 22Mar 18Mar 15Mar 11Mar 6Mar 2Feb 23
20°FMar 19Mar 13Mar 9Mar 5Mar 1Feb 26Feb 20Feb 13Feb 4
16°FMar 9Mar 2Feb 25Feb 18Feb 11Feb 5Jan 31Jan 25Jan 15

First freeze in fall

The chance of an earlier freeze than the date shown. At 10 percent, one fall in ten freezes before the date.

Threshold10%20%30%40%50%60%70%80%90%
36°FOct 8Oct 12Oct 15Oct 18Oct 20Oct 22Oct 25Oct 28Nov 1
32°FOct 16Oct 20Oct 23Oct 26Oct 29Nov 1Nov 2Nov 5Nov 11
28°FOct 27Nov 1Nov 3Nov 5Nov 8Nov 11Nov 14Nov 19Nov 26
24°FNov 4Nov 8Nov 12Nov 17Nov 21Nov 26Dec 1Dec 5Dec 12
20°FNov 13Nov 21Nov 27Dec 1Dec 6Dec 12Dec 21Jan 1Jan 7
16°FDec 1Dec 11Dec 22Dec 31Jan 3Jan 7Jan 12Jan 17Jan 26

Growing season length

Days between the last spring and first fall freeze at each threshold, with the chance of a season at least that long.

Threshold10%20%30%40%50%60%70%80%90%
36°F197191188184180176172167160
32°F222216211207203199195190183
28°F248241235230226222218213207
24°F279270263257253247242236228
20°F314304296289282275269262252
16°F350336330322315308302295284

How often it gets that cold

The share of years with at least one night at or below each temperature.

36°F or colder
100% of years
32°F or colder
100% of years
28°F or colder
100% of years
24°F or colder
100% of years
20°F or colder
100% of years
16°F or colder
96% of years

Degree days

A degree day is one degree of the daily mean temperature beyond a base, for one day. Heating degree days count cold (the fuel a house burns), cooling degree days heat, growing degree days the warmth a crop needs; each crop has its own base.

Heating degree days, base 65°F
3,850
Cooling degree days, base 65°F
1,468
Growing degree days, base 40°F
7,119
Growing degree days, base 45°F
5,666
Growing degree days, base 50°F
4,381
Growing degree days, base 55°F
3,253
Growing degree days, base 60°F
2,282

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January837017
February676022
March539490
April24636269
May80119505
June8296738
July0425890
August1362826
September26189614
October22234293
November492388
December724132

What this means

NOAA computes these from the daily lows at the station over 1991-2020, fitting the dates of each year's last and first freeze to a distribution, so a date can be stated at any level of risk. 36°F is a frost risk for tender plants on a clear, calm night, since the ground cools below the air above it; 32°F is a freeze; 28°F is a hard freeze that kills most annuals.

The station is 23.2 km from Dinwiddie County. Low ground, valleys and open fields freeze earlier and later than a town center or a hillside.

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Sources

NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal normals for station USC00448129 (Stony Creek 2 N). Public domain.